try yourself |run program

#include <stdio.h>
#include <conio.h>

void main(){
 int a;
 clrscr();
 printf("Enter of a: ");
 scanf("%d",&a);  /* & is used before variable name when you want to read data*/
 printf("\n value of a = %d",a);
 getch();
}

Program Output

Enter of a: 101
value of a = 101